<?php
/**
 * @author Bart Visscher <bartv@thisnet.nl>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin McCorkell <rmccorkell@karoshi.org.uk>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @copyright Copyright (c) 2015, ownCloud, Inc.
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
// use OCP namespace for all classes that are considered public.
// This means that they should be used by apps instead of the internal ownCloud classes
namespace OCP\Contacts {

	/**
	 * This class provides access to the contacts app. Use this class exclusively if you want to access contacts.
	 *
	 * Contacts in general will be expressed as an array of key-value-pairs.
	 * The keys will match the property names defined in https://tools.ietf.org/html/rfc2426#section-1
	 *
	 * Proposed workflow for working with contacts:
	 *  - search for the contacts
	 *  - manipulate the results array
	 *  - createOrUpdate will save the given contacts overwriting the existing data
	 *
	 * For updating it is mandatory to keep the id.
	 * Without an id a new contact will be created.
	 *
	 */
	interface IManager {

		/**
		 * This function is used to search and find contacts within the users address books.
		 * In case $pattern is empty all contacts will be returned.
		 *
		 * Example:
		 *  Following function shows how to search for contacts for the name and the email address.
		 *
		 *		public static function getMatchingRecipient($term) {
		 *			$cm = \OC::$server->getContactsManager();
		 *			// The API is not active -> nothing to do
		 *			if (!$cm->isEnabled()) {
		 *				return array();
		 *			}
		 *
		 *			$result = $cm->search($term, array('FN', 'EMAIL'));
		 *			$receivers = array();
		 *			foreach ($result as $r) {
		 *				$id = $r['id'];
		 *				$fn = $r['FN'];
		 *				$email = $r['EMAIL'];
		 *				if (!is_array($email)) {
		 *					$email = array($email);
		 *				}
		 *
		 *				// loop through all email addresses of this contact
		 *				foreach ($email as $e) {
		 *				$displayName = $fn . " <$e>";
		 *				$receivers[] = array(
		 *					'id'    => $id,
		 *					'label' => $displayName,
		 *					'value' => $displayName);
		 *				}
		 *			}
		 *
		 *			return $receivers;
		 *		}
		 *
		 *
		 * @param string $pattern which should match within the $searchProperties
		 * @param array $searchProperties defines the properties within the query pattern should match
		 * @param array $options - for future use. One should always have options!
		 * @return array an array of contacts which are arrays of key-value-pairs
		 */
		function search($pattern, $searchProperties = array(), $options = array());

		/**
		 * This function can be used to delete the contact identified by the given id
		 *
		 * @param object $id the unique identifier to a contact
		 * @param string $address_book_key identifier of the address book in which the contact shall be deleted
		 * @return bool successful or not
		 */
		function delete($id, $address_book_key);

		/**
		 * This function is used to create a new contact if 'id' is not given or not present.
		 * Otherwise the contact will be updated by replacing the entire data set.
		 *
		 * @param array $properties this array if key-value-pairs defines a contact
		 * @param string $address_book_key identifier of the address book in which the contact shall be created or updated
		 * @return array an array representing the contact just created or updated
		 */
		function createOrUpdate($properties, $address_book_key);

		/**
		 * Check if contacts are available (e.g. contacts app enabled)
		 *
		 * @return bool true if enabled, false if not
		 */
		function isEnabled();

		/**
		 * Registers an address book
		 *
		 * @param \OCP\IAddressBook $address_book
		 * @return void
		 */
		function registerAddressBook(\OCP\IAddressBook $address_book);

		/**
		 * Unregisters an address book
		 *
		 * @param \OCP\IAddressBook $address_book
		 * @return void
		 */
		function unregisterAddressBook(\OCP\IAddressBook $address_book);

		/**
		 * In order to improve lazy loading a closure can be registered which will be called in case
		 * address books are actually requested
		 *
		 * @param \Closure $callable
		 * @return void
		 */
		function register(\Closure $callable);

		/**
		 * @return array
		 */
		function getAddressBooks();

		/**
		 * removes all registered address book instances
		 * @return void
		 */
		function clear();
	}
}